Modeling gross national product the table gives the U.S. gross national product (GNP) for the years 1913-1922.
(a) Using x = 0 to represent 1912, find the cubic function that models the data.
(b) During what year in this time interval does the model predict a minimum GNP?
(c) During what year in this time interval does the model predict a maximum GNP?
